Computers in Principle and Practice Servers and Operating Systems.

Computers in Principle and Practice

Servers and Operating Systems

What is a computer?

Operating System

• Low level software that manages hardware resources and allows the user to execute applications

Operating Systems

Unix

• Fast, efficient, secure• Client-server architecture• Text commands

The Internet

The Internet

The Internet

• www.google.com = 173.194.34.104

The Internet

http://animals.howstuffworks.com/pets/dog-pictures.htm

=

File: dog-pictures.htmIn folder: petsOn server: animals.howstuffworks.com

Clients and Servers

Clients and Servers

Clients and Servers

First Web Pages

Login to the Server

• i5.nyu.edu• Netid• Nyu home password

• ssh [email protected]

Create a folder

• mkdir public_html

Change permissions

• chmod a+rx public_html• chmod u+rwx public_html

Create a web page

• cd public_html• cp /usr/local/share/index.html .• chmod u+rwx index.html • chmod a+r index.html

FTP

• Download• Upload